Sapphire is one of the commanders in the Negamoon Family, and the younger brother of Prince Diamond. His name is based off the gemstone Sapphire.
According to Sapphire in Episode 29, Rubeus "came crying to him after each of his lame attempts", and Sapphire did not want émeraude to do the same. He provided her with dark wedges to fill Tokyo's vulnerable spots with dark energy.
Sapphire was very suspicious of Wiseman, as he seemed to be egging Diamond on into putting new energy into the dark crystal's reactor, and Diamond did not realize that it could explode at any minute. Sapphire and Emerald...
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